linux-imx

// SPDX-License-Identifier: GPL-2.0-or-later

/*

 * fam15h_power.c - AMD Family 15h processor power monitoring

 *

 * Copyright (c) 2011-2016 Advanced Micro Devices, Inc.

 * Author: Andreas Herrmann <herrmann.der.user@googlemail.com>

 */

​

#include <linux/err.h>

#include <linux/hwmon.h>

#include <linux/hwmon-sysfs.h>

#include <linux/init.h>

#include <linux/module.h>

#include <linux/pci.h>

#include <linux/bitops.h>

#include <linux/cpu.h>

#include <linux/cpumask.h>

#include <linux/time.h>

#include <linux/sched.h>

#include <asm/processor.h>

#include <asm/msr.h>

​

MODULE_DESCRIPTION("AMD Family 15h CPU processor power monitor");

MODULE_AUTHOR("Andreas Herrmann <herrmann.der.user@googlemail.com>");

MODULE_LICENSE("GPL");

​

/* D18F3 */

#define REG_NORTHBRIDGE_CAP     0xe8

​

/* D18F4 */

#define REG_PROCESSOR_TDP       0x1b8

​

/* D18F5 */

#define REG_TDP_RUNNING_AVERAGE     0xe0

#define REG_TDP_LIMIT3          0xe8

​

#define FAM15H_MIN_NUM_ATTRS        2

#define FAM15H_NUM_GROUPS       2

#define MAX_CUS             8

​

/* set maximum interval as 1 second */

#define MAX_INTERVAL            1000

​

#define MSR_F15H_CU_PWR_ACCUMULATOR 0xc001007a

#define MSR_F15H_CU_MAX_PWR_ACCUMULATOR 0xc001007b

#define MSR_F15H_PTSC           0xc0010280

​

#define PCI_DEVICE_ID_AMD_15H_M70H_NB_F4 0x15b4

​

struct fam15h_power_data {

    struct pci_dev *pdev;

    unsigned int tdp_to_watts;

    unsigned int base_tdp;

    unsigned int processor_pwr_watts;

    unsigned int cpu_pwr_sample_ratio;

    const struct attribute_group *groups[FAM15H_NUM_GROUPS];

    struct attribute_group group;

    /* maximum accumulated power of a compute unit */

    u64 max_cu_acc_power;

    /* accumulated power of the compute units */

    u64 cu_acc_power[MAX_CUS];

    /* performance timestamp counter */

    u64 cpu_sw_pwr_ptsc[MAX_CUS];

    /* online/offline status of current compute unit */

    int cu_on[MAX_CUS];

    unsigned long power_period;

};

​

static bool is_carrizo_or_later(void)

{

    return boot_cpu_data.x86 == 0x15 && boot_cpu_data.x86_model >= 0x60;

}

​

static ssize_t power1_input_show(struct device *dev,

                 struct device_attribute *attr, char *buf)

{

    u32 val, tdp_limit, running_avg_range;

    s32 running_avg_capture;

    u64 curr_pwr_watts;

    struct fam15h_power_data *data = dev_get_drvdata(dev);

    struct pci_dev *f4 = data->pdev;

​

    pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5),

                  REG_TDP_RUNNING_AVERAGE, &val);

​

    /*

     * On Carrizo and later platforms, TdpRunAvgAccCap bit field

     * is extended to 4:31 from 4:25.

     */

    if (is_carrizo_or_later()) {

        running_avg_capture = val >> 4;

        running_avg_capture = sign_extend32(running_avg_capture, 27);